Quote:
Originally Posted by Joyride_67_1902
I don't know the pitch of the gear but they are roughly 1/4 inch thick.
120 tooth gear is close to 4 inches in diameter
80 tooth gear is close to 3 inches in diameter
and 40 tooth gear is just over 1 inch in diameter.
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Andrew, if you've got a set of calipers, try this: take 2 more than the number of teeth, and divide by the outer diameter (measure the outside diameter across the rounded outer surfaces of two opposed teeth). For a conventional AGMA involute spur gear, this will be the diametral pitch.
(I always assumed they were 32 diametral pitch, but then again, I never had to use them for anything. They could just as well be 0.8 module, which is 31.75 diametral pitch.)